/Engine/Source/Editor/GraphEditor/Public/SGraphPin.h
Override the visual look of the pin by providing two custom brushes
void SetCustomPinIcon ( const [FSlateBrush](API\Runtime\SlateCore\Styling\FSlateBrush) * InConnectedBrush, const [FSlateBrush](API\Runtime\SlateCore\Styling\FSlateBrush) * InDisconnectedBrush )